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Differential pulse anodic strip** voltammetric determination of Hg2+ at poly(Eriochrome Black T)-modified carbon paste electrode

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Abstract

The electrochemical behavior of Hg2+ was investigated in poly(Eriochrome Black T)-modified carbon paste electrode (CPE) using cyclic voltammetry (CV). Poly(Eriochrome Black T) was prepared in an alkaline medium on the surface of the CPE using a solution of Eriochrome Black T with the CV technique. The electrochemical impedance study revealed a better charge transfer kinetics at the modified electrode. The effects of variation of the experimental conditions, such as the concentration of electrolytes, pH, deposition time, and the deposition potential, which maximize current efficiency were studied. The optimum response of Hg2+ was observed in 1.0 M KCl solution. The differential pulse anodic strip** voltammetric technique was employed successfully to detect Hg2+, which gave a good linear response at low concentration levels of Hg2+. The detection limit was found to be 2.2 × 10−10 M (S/N = 3), which is comparable with that achieved in multiwall carbon nanotube-modified electrode. The remarkable electroanalytical performance of the modified electrode makes it amenable to employ it successfully as an electrochemical sensor for the determination of hazardous pollutant Hg2+ in environmental samples.

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Acknowledgments

The authors are grateful for the financial support given by the University Grants Commission, New Delhi of India, under the Major Research Project No. UGC. F.No.38-232/2009 (SR) to carry out the present research work. The authors also thank Dr. Suresh of SSMRV College, Bangalore, for providing the EIS facility.

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Authors and Affiliations

  1. Department of Postgraduate Studies and Research in Chemistry, St. Joseph’s College (Autonomous), Lalbagh Road, Bangalore, 560 027, Karnataka, India

    Kalyani Sri Guha

  2. Electrochemistry Research Group, Department of Chemistry, St. Joseph’s College (Autonomous), Lalbagh Road, Bangalore, 560 027, Karnataka, India

    Ronald J. Mascarenhas, Tony Thomas & Ozma J. D’Souza

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  1. Kalyani Sri Guha
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Correspondence to Ronald J. Mascarenhas.

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Guha, K.S., Mascarenhas, R.J., Thomas, T. et al. Differential pulse anodic strip** voltammetric determination of Hg2+ at poly(Eriochrome Black T)-modified carbon paste electrode. Ionics 20, 849–856 (2014). https://doi.org/10.1007/s11581-013-1040-9

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